Bore kit to bring 300ex to a true 300cc?

[300exHILLER]

Does anybody know of any bore kit other other means of getting 300cc out of a 300EX. The reason I'm asking cause I'm planning to start racing and the class is unlimited up to 300cc. I will also be selling my E-series to get a Sparks pipe. Besides the usual mods (filter, jets, pipe, bore kit) what else can I do to the engine to get more power.

get a cam

[honda250xrider]

port and polish put bigger vavles instead of the curtis sparks pipe i would get a tc racing pipe

[Juggalo]

you won't notice any difference in power. don't bore it its not worth it. like they were sayin get a cam and a port and polish too if you can afford it. get a head pipe if you don't already have one.

[300exHILLER]

thanks guys. What is the best cam and where can I get it from? How much $?

[Scott]

Yeah, maximize the flow through what you have before you bore it if you're trying to stay at or below 300ccs. The smallest kit I was aware of is a 305cc kit.

So instead, mod the airbox, better air filter, port and polish the head, larger valves, more aggressive cam, hardened rockers, better headpipe and muffler. While you're at it, maybe bump the compression up but leave the stock bore. That's probably about as wild as you can go and still leave the bore stock.

[honda250xrider]

i like my web cam im not sure how much it cost and if you get a high compression piston i would go with weisco 12;1 compression

[Red Rooster]

Wiesco 11 to 1 .080 over piston (298cc's) (i did the math)
Webcam
Valve springs
o/s intake valves
carb
etc. etc. It all boils down to how fast you can afford to go!

[Scott]

I'd double check that. I didn't check your math, but I thought .080" over was the 305 kit.

how would the place you race at know if your running an extra 5 cc's over the limit?

[Rastus]

Do you guys think i could race with mine, and be competitive?

[DEAL]

Yeah you could for sure , you just might want some shocks first.